Key-value storage method, apparatus, and system

A host, wherein the host comprises a processing module and a communications module, wherein

• the processing module is configured to:
• after a key-value storage request is detected, write a first instruction code and address information that are carried in the key-value storage request to a field defined in a protocol, to constitute a first storage request instruction sequence, wherein the first instruction code is an instruction code defined based on a reserved extension field in the protocol;
• and
• the communications module is configured to interact with the storage controller, so that the storage controller obtains the first storage request instruction sequence.

A storage controller, wherein the storage controller comprises a front-end communications module, a back-end communications module, a processing module, and a control module, wherein

• the front-end communications module is configured to obtain a first storage request instruction sequence from a host, wherein the first storage request instruction sequence is constituted by writing, by the host, a first instruction code and address information that are carried in a key-value storage request to a field defined in a protocol, wherein the first instruction code is an instruction code defined based on a reserved extension field in the protocol;
• the processing module is configured to extract the first instruction code and the address information from the first storage request instruction sequence;
• and
• the control module is configured to perform, by using the back-end communications module, an operation corresponding to the first instruction code on a storage device based on the first instruction code and the address information.